April 5, 2022
Navigation in Space, Sizes of Black Holes and Planet 9 | Q&A 178
In this week's live Questions and Answers show, I explain how big black holes are, what coordinate system astronomers use to map objects in the sky, and what could have collapsed clouds of hydrogen to form the first stars?
Watch the video here or on YouTube:
https://www.youtube.com/watch?v=Kmz1xoou9Cs
You can watch the original, unedited livestream here:
Navigation in Space, Sizes of Black Holes and Planet 9 _ Q&A 178.mp4 (Vimeo)